Less than two weeks after white supremacists marched in Boston on Fourth of July weekend, the local figure who said he was assaulted by the marchers was back in Copley Square on Thursday evening as part of a performance group dedicated to advancing social justice. Charles Murrell III performed just yards away from the spot where he says he encountered members of the Patriot Front on July 2, according to a statement by the New Democracy Coalition. The coalition helped organize the performance with Beheard.world , a Cambridge-based performance troupe that counts Murrell among its 14 members. Beheard.world describes itself...